#aboutUs {
    width: 100%;
    height: 701px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-image: url('http://www.besthmedu.com/bshz-new/imgs/gywom.png');
    background-repeat: no-repeat;
    background-size:100% 100%;
}
#abMain {
    width: 1200px;
    height: 434px;
    display: flex;
    justify-content: space-between;
}
#abMain li:nth-child(1) {
    width: 570px;
    height: 434px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
#abMain li:nth-child(1) p:nth-child(1) {
    font-weight: bold;
    font-size: 52px;
    margin-bottom: 20px;
}
#abMain li:nth-child(1) p:nth-child(2) {
    font-weight: 400;
    font-size: 26px;
    color: #666666;
    margin-bottom: 26px;
}
#abMain li:nth-child(1) p:nth-child(3) {
    width: 52px;
    height: 3px;
    background-color: #f34804;
    margin-bottom: 27px;
}
#abMain li:nth-child(1) p:nth-child(4) {
    width: 520px;
    font-weight: 400;
    font-size: 14px;
    color: #999999;
    margin-bottom: 26px;
}
#abMain li:nth-child(1) p:nth-child(5) a{
    display: block; 
    width: 206px;
    height: 52px;
    background-image: url('http://www.besthmedu.com/bshz-new/imgs/tiaoz.png');
}
#abMain li:nth-child(2) {
    display: flex;
    flex-direction: column;
    justify-content: end;
}